On Sun, Oct 26, 2025 at 01:19:05PM -0700, Xin Li (Intel) wrote:
>From: Xin Li <xin3.li@intel.com>
>
>Advertise support for FRED to userspace after changes required to enable
>FRED in a KVM guest are in place.
I'm not sure if AMD CPUs support FRED, but just in case, we can clear FRED
i.e., kvm_cpu_cap_clear(X86_FEATURE_FRED) in svm_set_cpu_caps().
With this fixed:
Reviewed-by: Chao Gao <chao.gao@intel.com>
>
>Signed-off-by: Xin Li <xin3.li@intel.com>
>Signed-off-by: Xin Li (Intel) <xin@zytor.com>
>Tested-by: Shan Kang <shan.kang@intel.com>
>Tested-by: Xuelian Guo <xuelian.guo@intel.com>
>---
>
>Change in v5:
>* Don't advertise FRED/LKGS together, LKGS can be advertised as an
> independent feature (Sean).
>* Add TB from Xuelian Guo.
>---
> arch/x86/kvm/cpuid.c | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
>index d563a948318b..0bf97b8a3216 100644
>--- a/arch/x86/kvm/cpuid.c
>+++ b/arch/x86/kvm/cpuid.c
>@@ -1014,6 +1014,7 @@ void kvm_set_cpu_caps(void)
> F(FSRS),
> F(FSRC),
> F(WRMSRNS),
>+ X86_64_F(FRED),
> X86_64_F(LKGS),
> F(AMX_FP16),
> F(AVX_IFMA),
>--
>2.51.0
>